semagrow / semagrow

A SPARQL query federator of heterogeneous data sources

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Query in deployment instructions returns error

wood-chris opened this issue · comments

When following the deployment instructions at http://semagrow.github.io/deployment-instructions/ and trying the query at the end as a test:

prefix dct: <http://purl.org/dc/terms/>.
prefix xsd: <http://www.w3.org/2001/XMLSchema#>.
select (count(?s) as ?num) {
   ?s dct:issued ?a.
   ?s dct:type "Image".
   filter(xsd:integer(?a) > 2005).
   filter(xsd:integer(?a) < 2009).
}

an error is returned:

<!DOCTYPE html><html><head><title>Apache Tomcat/8.5.3 - Error report</title><style type="text/css">H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}.line {height: 1px; background-color: #525D76; border: none;}</style> </head><body><h1>HTTP Status 500 - Internal error: null</h1><div class="line"></div><p><b>type</b> Status report</p><p><b>message</b> <u>Internal error: null</u></p><p><b>description</b> <u>The server encountered an internal error that prevented it from fulfilling this request.</u></p><hr class="line"><h3>Apache Tomcat/8.5.3</h3></body></html>

note this is a 500 error, and happens regardless of the configuration file supplied